The equation y=−21x+41 defines a relationship between x and y, where x is the input and y is the output. Which statements about the relationship are true? Select all that apply.Multi-select Choices:(A)The graph is a straight line.(B)When the input is 2, the output is −1.(C)The rate of change is constant.(D)y is a function of x.(E)The y-intercept is (0,−21).
Q. The equation y=−21x+41 defines a relationship between x and y, where x is the input and y is the output. Which statements about the relationship are true? Select all that apply.Multi-select Choices:(A)The graph is a straight line.(B)When the input is 2, the output is −1.(C)The rate of change is constant.(D)y is a function of x.(E)The y-intercept is (0,−21).
Identify Equation Type: First, identify the type of equation. y=−21x+41 is a linear equation because it is in the form y=mx+b, where m and b are constants.
Check Linearity: Check if the graph is a straight line. Since it's a linear equation, its graph will indeed be a straight line.
Calculate Output: Calculate the output when the input x is 2. Substitute x=2 into the equation:y=−21(2)+41=−1+41=−43.
Constant Rate of Change: Determine if the rate of change is constant. The coefficient of x, −21, represents the slope, which is the rate of change in a linear equation. This rate is constant.
Verify Functionality: Verify if y is a function of x. In the equation y=−21x+41, for each value of x, there is exactly one corresponding value of y, which satisfies the definition of a function.
Identify Y-Intercept: Identify the y-intercept. The y-intercept is the value of y when x=0. Substitute x=0:y=−21(0)+41=41.This shows the y-intercept is (0,41), not (0,−21).
More problems from Write equations of cosine functions using properties